CFHKStore Round Shape Quartz Hour Meter Gauge For Car Bus Motorcycle Engine AC/DC 6V~80V Round shape 6 digital display hour meter. Easy-to-read hour meter with novel design. Compact size, can be operated within a wide voltage range. Fits for a 2 inch round hole whose outside diameter is 2.3 inch. Depth behind the panel: approx. 1.7 inch (plugs included).